05000440/LER-2006-004, Re Oscillation Power Range Monitors (Oprms) Inoperable
| ML063250319 | |
| Person / Time | |
|---|---|
| Site: | Perry  |
| Issue date: | 11/13/2006 |
| From: | Pearce L FirstEnergy Nuclear Operating Co |
| To: | Document Control Desk, Office of Nuclear Reactor Regulation |
| References | |
| PY-CEI/NRR-2997L LER-06-004-00 | |
| Download: ML063250319 (5) | |
| Event date: | |
|---|---|
| Report date: | |
| Reporting criterion: | 10 CFR 50.73(a)(2)(i) 10 CFR 50.73(a)(2)(vii), Common Cause Inoperability 10 CFR 50.73(a)(2)(ii) 10 CFR 50.73(a)(2)(viii)(A) 10 CFR 50.73(a)(2)(ii)(B), Unanalyzed Condition 10 CFR 50.73(a)(2)(viii)(B) 10 CFR 50.73(a)(2)(iii) 10 CFR 50.73(a)(2)(ix)(A) 10 CFR 50.73(a)(2)(iv)(A), System Actuation 10 CFR 50.73(a)(2)(x) 10 CFR 50.73(a)(2)(v)(A), Loss of Safety Function - Shutdown the Reactor 10 CFR 50.73(a)(2)(v)(B), Loss of Safety Function - Remove Residual Heat 10 CFR 50.73(a)(2)(i)(A), Completion of TS Shutdown 10 CFR 50.73(a)(2)(v), Loss of Safety Function 10 CFR 50.73(a)(2)(i)(B), Prohibited by Technical Specifications |
| 4402006004R00 - NRC Website | |
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FENOC FirstEnergy Nuclear Operating Company Perry Nuclear Power Station 10 Center Road Perry, Ohio 44081 L. William Pearce Vice President 440-280-5382 Fax: 440-280-8029 November 13, 2006 PY-CEI/NRR-2997L United States Nuclear Regulatory Commission Document Control Desk Washington, D.C. 20555 Perry Nuclear Power Plant Docket No. 50-440 Licensee Event Report 2006-004 Ladies and Gentlemen:
Enclosed is Licensee Event Report (LER) 2006-004, "Oscillation Power Range Monitors (OPRMs) Inoperable."
There are no regulatory commitments contained in this letter. Any actions discussed in this document that represent intended or planned actions, are described for the NRC's information, and are not regulatory commitments.
If you have questions or require additional information, please contact Mr. Jeffrey J. Lausberg, Manager - Regulatory Compliance, at (440) 280-5940.
Ve r t, y urs,/o Enclosure: LER 2006-004 cc: NRC Project Manager NRC Resident Inspector NRC Region III 1/4J
NRC FORM 366 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB NO. 3150-0104 EXPIRES 6/30/2007 (6-2004)
, the NRC may not conduct or (See reverse for required number of sponsor, and a person is not required to respond to, the information collection.
digits/characters for each block)
- 3. PAGE Perry Nuclear Power Plant 05000440 1 OF 4
- 4. TITLE OSCILLATION POWER RANGE MONITORS (OPRMs) INOPERABLE
- 5. EVENT DATE
- 6. LER NUMBER
- 7. REPORT DATE
- 8. OTHER FACILITIES INVOLVED SEQUENTIAL REV FACILITY NAME DOCKET NUMBER MONTH DAY YEAR YEAR NUMBER NO.
MONTH DAY YEAR FACILITY________NAME__
jDOCKET NUMBER 09 21 2006 2006 004 -
00 11 13 2006 FACILITY NAME
- 9. OPERATING MODE
- 11. THIS REPORT IS SUBMITTED PURSUANT TO THE REQUIREMENTS OF 10 CFR §: (Check all that apply)
[1 20.2201(b)
[
20.2203(a)(3)(i)
[_1 50.73(a)(2)(i)(C) 0 50.73(a)(2)(vii)
E] 20.2201 (d)
[]
20.2203(a)(3)(ii)
E]
50.73(a)(2)(ii)(a)
E] 50.73(a)(2)(viii)(A)
F] 20.2203(a)(1)
[]
20.2203(a)(4)
[]
50.73(a)(2)(ii)(B)
[] 50.73(a)(2)(viii)(B)
E] 20.2203(a)(2)(i)
[
50.36(c)(1)(i)(A)
E]
50.73(a)(2)(iii)
El 50.73(a)(2)(ix)(A)
- 10. POWER LEVEL ED 20.2203(a)(2)(ii)
El 50.36(c)(1)(ii)(A)
E]
50.73(a)(2)(iv)(A) 0 50.73(a)(2)(x)
E] 20.2203(a)(2)(iii)
El 50.36(c)(2)
[]
50.73(a)(2)(v)(A)
[:] 73.71 (a)(4) 100
[] 20.2203(a)(2)(iv)
[-I 50.46(a)(3)(ii)
[]
50.73(a)(2)(v)(B)
El 73.71 (a)(5)
E] 20.2203(a)(2)(v)
Ej 50.73(a)(2)(i)(A)
[
50.73(a)(2)(v)(C)
E] OTHER Specify in Abstract below E] 20.2203(a)(2)(vi)
[
50.73(a)(2)(i)(B)
[
50.73(a)(2)(v)(D) or in (If more space is required, use additional copies of (If more space is required, use additional copies of (If more space is required, use additional copies of NRC Form 366A) plant operators to declare the OPRMs inoperable upon entry into Single Loop Operations. Entry in Single Loop Operations would require plant operators to initiate an alternate method to detect and suppress thermal hydraulic instability oscillations. Subsequent reviews concluded the OPRMs were inoperable under all conditions. On September 21, 2006, plant operators declared the OPRMs inoperable and entered TS LCO 3.3.1.3 Action B.1. As required by the TS Action, plant operators initiated alternate method to detect and suppress thermal hydraulic instability oscillations.
Additional corrective actions to be taken are:
- 1. Calculation FM-01 2 "OPRM Device Settings and Setpoints has been revised to update the OPRM Enabled Region Total Drive Flow Setpoint. The revised setpoint is based on current cycle data coupled with expected conditions during Single Loop Operations. The revised setpoint of 63.5 percent total drive flow is greater than the GE Safety Communication recommended value of 60 percent total drive flow.
- 2.
The OPRM setpoint change to the revised setpoint of 63.5 percent is currently scheduled to be completed the week of November 27, 2006. Once the setpoint change to 63.5 percent total drive flow is completed, the OPRMs will be declared operable.
- 3.
Lessons learned regarding choosing an appropriate independent verifier for an important calculation will be presented to the various Engineering Departments' Training Review Committee as part of the Systematic Approach to Training process.
VI. PREVIOUS SIMILAR EVENTS
LER 2001-002, "Oscillation Power Range Monitors Inoperable due to Non-Conservative Setpoints,"
documents a similar event at Perry. The Perry plant staff was notified by (GE) via a BWROG conference call on June 27, 2001, at approximately 1130 that the OPRM instrumentation SCRAM setpoints were non-conservative due to non-conservative analysis. The OPRM equipment was therefore considered inoperable since first placed into service following the scheduled refueling outage in March 2001.
All OPRM channels were declared INOPERABLE and administrative procedural controls were implemented to monitor potential oscillations in reactor power. In August 2004, the OPRM setpoints were changed and Operations declared the OPRM's operable again. None of the issues investigated by the GE and the Detect and Suppress Subcommittee since 2001 involved the OPRM Enabled Region Total Drive Flow Setpoint. The process for determining this setpoint remained unchanged. Based on this fact it could not be reasonably expected that the corrective actions associated with LER 2001-002 should have prevented the condition documented in LER 2006-004.
VII. COMMITMENTS
There are no regulatory commitments contained in this report. Any actions discussed in this document that represent intended or planned actions, are described for the NRC's information, and are not regulatory
commitments